DP/USB-C/Thunderbolt 3/4 to HDMI 2.1 4k@120hz RGB4:4:4 10b HDR with Apple Silicon M1/M2/M3 now possible !

[FrankScandalous]

Unfortunately I can’t get a windows PC to my place but the guy at the local repair store is happy to run the firmware update for me if I bring him the dongle. Does anyone know if he can do it connected to any tv/ monitor, or does it have to be my LG C3 42 OLED which I plan on using the adapter with?

Thanks for your advice!

 

[phoenix-mac-user]

Did you update your dock firmware or are you able to check what firmware it's on? I got a WD22TB and figured I might as well update the firmware for it while I was on a PC. Found out today, a firmware update breaks wake functionality. I never tried it vanilla, so I'll never know unfortunately.

I did not update it and am not sure how to even check the firmware version. I bought it used off Facebook Marketplace and plugged it in and used it. Good to know that I shouldn't try to update it.

 

[psyguy]

Unfortunately I can’t get a windows PC to my place but the guy at the local repair store is happy to run the firmware update for me if I bring him the dongle. Does anyone know if he can do it connected to any tv/ monitor, or does it have to be my LG C3 42 OLED which I plan on using the adapter with?

Thanks for your advice!

You can plug it into any monitor. I do mines with a dummy plug.

 

[AppelGeenyus]

Got cablematters adapter + their custom firmware working on M1 Max MBP. Even allows 4K @144Hz with full 4:4:4 which was surprising.

Unfortunately, it’s kinda buggy for me. Sometimes if I switch inputs on my monitor then back to the hdmi input for my mac the screen is permanently black(but still detects a signal) until I disconnect and reconnect the adapter, or simply reboot.

Also no HDR.

 

[psyguy]

An interesting find that the Dell USB-C dock actually support 4k@120hz 10bit HDR natively on MacBook M1/M2 w/ betterDisplay.

I recently purchased this Dell HD22Q USB-C dock, It claimed only support 4K@60hz or 8k@30hz but says it's HDMI 2.1 compatible:

View attachment 2300937

But when I hook it up with my MacBook Pro M1 Pro, it magically support 4k@120hz 10bit natively:

View attachment 2300938
I thought there is no way this thing can support 4k@120hz natively given we have tried numerously way to get that working with help of custom firmware, but it's right there. without any probe or tinkering, it support 4k@120hz on my LG CX(more explain later).

Then I changed to my Windows laptop and using the tool to read what chip and firmware it use, it showed this
So looks like a VMM6211 running firmware 6.05:
View attachment 2300940


Also under Windows, it can output 4k@120hz 10bit without problem:

View attachment 2300939

Since it's running VMM6211 chip, I think the reason it can output 4k@120hz under mac is because I have betterDisplay with EDID custom running at the background because my main adapter is a cable matter VM6100 adapter, so I did my due diligence back when @stevemr123 post his original method.

To verify my hypothesis, I use my wife's MacBook Air M2, which officially don't support 4k@120 10bit natively, It sure can't output 4k@120 10bit, only 4k@60 8bit output like before. But after I installed betterDisplay and created mod custom EDID file, it works again.

TL;DR:

Dell HD22Q USB-C dock can support 4k@120hz 10bit natively under Windows and MacOS(w/ custom EDID from betterDisplay), it's build on VMM6211, so for whom like to utilize more features like PD charging in a single cable/output 4k/USB ports for peripherals, this is a great choice.

Thanks @AironMan and @stevemr123 for the great work!

I am HAPPY to report that this solution worked spectacularly! Thank you for finding this. No wake issues (so far) or color profile changing issues (so far). It's on sale now, with a few cashbacks from Honey and Capital One, plus employee discount bring it to about $70. I needed a phone dock for my desk, so this is a bonus. The Dell Dock TB4 I bought might gather dust for a bit.

The only thing that doesn't show up for me in the LG Display info is SDR and HDR10, even though I have them on. Unsure if this matters or if I should have enabled HDR via BetterDisplay. I do get the HDR logo to appear at least.

 

[razzfazz0815]

Does anyone happen to know what exactly the custom firmware actually changes?

I have a QUUGE USB4 dock that has a VMM7100 built in, but it looks like it's using a different firmware than the DP and USB-C cables with the same chipset. (FWIW, Better Display tells me that transport is DP in both upstream and downstream right now; and it seems like M1 Pro MBP is unable to negotiate DSC with my display (Gigabyte FV43U) when connected via the dock.)

 

[joevt]

Does anyone happen to know what exactly the custom firmware actually changes?

Someone with an Intel Mac could compare the DPCD info of the adapter using AllRez. The firmware could change other info that is not reflected in the DPCD.

 

[liminalsunset]

I have a 2023 Samsung QN90C (43QN90C) and a Mac Mini M1 on macOS 14.0 (23A344). I bought the Cable Matters Foldable USB-C to HDMI 2.1 adapter, 201398-BK (has the folding short USB-C lead attached to a rounded rectangular plastic adapter in black).

I was able to successfully flash the device using a physical Windows 11 computer (requires monitor to be plugged into adapter, else the device won't be detected. Adapter works while flashing).

4K 144Hz 4:4:4 is working correctly under Game Mode, but I'm not able to tell if it's running at 8 or 10 bits. I can access the service menu on the TV but it doesn't provide any such information like on LG devices. There is no VRR support or option that I can see.

EDIT: HDR is working fine, I just had a misunderstanding about how HDR is supposed to work. Firefox YouTube HDR is broken but it works totally fine in Chrome or Safari.

It is normal for the screen to be dimmer in HDR because that's how it works (The Desktop is in SDR; unlike in Windows, there is no 'SDR/HDR balance' option to adjust the level that SDR content should target). BetterDisplay's XDR/HDR Overdrive feature is a good workaround, but I'll just leave HDR off for the most part because I don't need it.

HDR control in macOS is working; HDR can be enabled, and 4:4:4 still works, but there is a problem.

The tone mapping of an HDR YouTube video is completely incorrect, because the highlights are totally blown out and the black levels are messy. The content is not watchable. I've tried all of the combinations of HDR10+ Gaming Basic/Advanced, and Game HDR Basic/Advanced and they do not really help. It's not possible to change the gamma to HLG or any other setting, it is stuck on ST.2084.

I'm wondering if the lack of proper HDR is the fault of the TV, the adapter, the Mac, the OS, or whether there's just a setting I've missed. I suppose the lack of HDR is not the end of the world, but it would be nice to get it working.

Thanks!

 

[Jony Ive]

I flashed the 201428-gry (HDMI+USB C with Power Delivery) with the VMM7100 and I bricked it, so don't do it.
I can't seem to recover it, not even with the app from Windows store :/

 

[acmac]

Got cablematters adapter + their custom firmware working on M1 Max MBP. Even allows 4K @144Hz with full 4:4:4 which was surprising.

Unfortunately, it’s kinda buggy for me. Sometimes if I switch inputs on my monitor then back to the hdmi input for my mac the screen is permanently black(but still detects a signal) until I disconnect and reconnect the adapter, or simply reboot.

Also no HDR.

This is the same behavior I experience, and there are also issues with the monitor waking up when bringing the MBP out of sleep. The same black screen then the monitor goes into standby. The only way to get the mac to recognize the display again is unplug and plug back in.

In order to get the mac to recognize the monitor after waking it from sleep is to first turn the monitor on, then wake the MBP.

I've already tried every configuration change on the monitor, the mac, everything and nothing resolves the issue. Lowering the refresh rate doesn't work either, same issue. I posted earlier in this thread where I found the only reliable way to wake the monitor with the mac is to use "hibernatemode 25", but that mode sucks. It takes a long time to wake the mac, and you have to enter your password, unlike regular sleep.

I really think its an issue with the MBP and not the adapter. I use the same adapter (albeit with the default firmware) with my Windows work laptop and waking the monitor isn't an issue with it, works everytime and never loses signal. There are also many other reports of macs having issues with external monitors connected through an adapter in general, not just those from Cable Matters.

 

[AppelGeenyus]

Has anyone tried calibrating their monitor through a flashed cablematters(or any other brand) adapter? At first everything seemed fine but near-black values appear to be completely crushed no matter what I do.

 

[psyguy]

Has anyone tried calibrating their monitor through a flashed cablematters(or any other brand) adapter? At first everything seemed fine but near-black values appear to be completely crushed no matter what I do.

Can you specify the following details:

1. Monitor/TV
2. Adapter & HDMI/DP cable
3. Computer & connection method
4. Display configuration (Resolution, color space, refresh rate, etc)

 

[DogOfPavlov]

I just wanted to post and give my experience with Samsung's new Odyssey G9 Neo 57" (Native Resolution of 7,680 x 2,160 at 240hz)

Even though this monitor is 240hz, my goal is honestly to get at least 120hz on both PC and Mac at the full 7,680 x 2,160.

I plan to use this monitor with both my PC and M1 Macbook Pro through the monitors built in KVM. My PC has a 2080ti (I know I know) but since that GPU can only do 120hz through DP, I'm left with trying to use HDMI for my M1 MBP.

I bought both the Cable Matters Adapter (USB-C to HDMI 2.1) as well as the Anker Adapter (USB-C to HDMI 2.1) (both VMM7100). After flash both of them with the new firmware (through Parallels on my Mac) here are my findings for the Macbook Pro M1.

Using a single adapter USB-C to HDMI 2.1 (flashed with the latest firmware) I was only able to achieve 5,120 x 1440 (120hz). Without flashing I got the same resolution but only 60hz.

Using both adapters USB-C to HDMI 2.1 (Cable Matters and Anker) plugged into the same monitor, I enabled the PBP (Picture by Picture) and able to achieve 3840x2160 for each half of the screen (so total 7680x2160)... but only 1 side can do 120hz while the other side is locked to 60hz. I should note both sides of the screen would allow the Macs scaling (because otherwise things are way too small).

If anyone knows a workaround to get the full 7,680 x 2,160 at 120hz on a Macbook Pro M1 through USB-C to HDMI please let me know.

Until then I will probably just stick to using a single Adapter and running 5,120 x 1440 120hz because having half the screen in 60hz is really annoying.

Another option I've considered is to stick with DP on the Mac (since it can do 7,680x2,160 at 120hz) and try to find a DP to HDMI for my PC.

 

[liminalsunset]

I have a 2023 Samsung QN90C (43QN90C) and a Mac Mini M1 on macOS 14.0 (23A344). I bought the Cable Matters Foldable USB-C to HDMI 2.1 adapter, 201398-BK (has the folding short USB-C lead attached to a rounded rectangular plastic adapter in black).

I was able to successfully flash the device using a physical Windows 11 computer (requires monitor to be plugged into adapter, else the device won't be detected. Adapter works while flashing).

4K 144Hz 4:4:4 is working correctly under Game Mode, but I'm not able to tell if it's running at 8 or 10 bits. I can access the service menu on the TV but it doesn't provide any such information like on LG devices. There is no VRR support or option that I can see.

EDIT: HDR is working fine, I just had a misunderstanding about how HDR is supposed to work. Firefox YouTube HDR is broken but it works totally fine in Chrome or Safari.

It is normal for the screen to be dimmer in HDR because that's how it works (The Desktop is in SDR; unlike in Windows, there is no 'SDR/HDR balance' option to adjust the level that SDR content should target). BetterDisplay's XDR/HDR Overdrive feature is a good workaround, but I'll just leave HDR off for the most part because I don't need it.

HDR control in macOS is working; HDR can be enabled, and 4:4:4 still works, but there is a problem.

The tone mapping of an HDR YouTube video is completely incorrect, because the highlights are totally blown out and the black levels are messy. The content is not watchable. I've tried all of the combinations of HDR10+ Gaming Basic/Advanced, and Game HDR Basic/Advanced and they do not really help. It's not possible to change the gamma to HLG or any other setting, it is stuck on ST.2084.

I'm wondering if the lack of proper HDR is the fault of the TV, the adapter, the Mac, the OS, or whether there's just a setting I've missed. I suppose the lack of HDR is not the end of the world, but it would be nice to get it working.

Thanks!

Update: Seems like after turning off the TV and leaving it overnight with computer on but display sleeping, in the morning, needs to be replugged [unplug and replug the USB C, not the HDMI] to turn on, and the TV seems to detect the computer as something different.

I have since updated the computer to 14.1.1, and HiDPI HDR 4:4:4 is still working for me. Will report back on whether the sleep issue is still present

Update 2: Yes, the sleep issue is still present. An interesting tidbit is that unlike earlier users of this thread, the computer isn't actually going to sleep at all - I set it to stay on all the time. What seems to kill it is leaving the monitor disabled (screen off) for longer than a short while. I haven't figured out how long "short while" is, but it seems to be longer than a few seconds and shorter than hours. For now, my workaround is to use the screen saver, and just turn the display on and off with the remote, which is necessary even without the bug.

 

[DavesMac]

I just wanted to post and give my experience with Samsung's new Odyssey G9 Neo 57" (Native Resolution of 7,680 x 2,160 at 240hz)

Even though this monitor is 240hz, my goal is honestly to get at least 120hz on both PC and Mac at the full 7,680 x 2,160.

I plan to use this monitor with both my PC and M1 Macbook Pro through the monitors built in KVM. My PC has a 2080ti (I know I know) but since that GPU can only do 120hz through DP, I'm left with trying to use HDMI for my M1 MBP.

I bought both the Cable Matters Adapter (USB-C to HDMI 2.1) as well as the Anker Adapter (USB-C to HDMI 2.1) (both VMM7100). After flash both of them with the new firmware (through Parallels on my Mac) here are my findings for the Macbook Pro M1.

Using a single adapter USB-C to HDMI 2.1 (flashed with the latest firmware) I was only able to achieve 5,120 x 1440 (120hz). Without flashing I got the same resolution but only 60hz.

Using both adapters USB-C to HDMI 2.1 (Cable Matters and Anker) plugged into the same monitor, I enabled the PBP (Picture by Picture) and able to achieve 3840x2160 for each half of the screen (so total 7680x2160)... but only 1 side can do 120hz while the other side is locked to 60hz. I should note both sides of the screen would allow the Macs scaling (because otherwise things are way too small).

If anyone knows a workaround to get the full 7,680 x 2,160 at 120hz on a Macbook Pro M1 through USB-C to HDMI please let me know.

Until then I will probably just stick to using a single Adapter and running 5,120 x 1440 120hz because having half the screen in 60hz is really annoying.

Another option I've considered is to stick with DP on the Mac (since it can do 7,680x2,160 at 120hz) and try to find a DP to HDMI for my PC.

I have exact same setup with M1 Mac Studio and PC for work. PbP mode is the only way to get full resolution (dual 4K@120Hz). Use 1 input in USB-C to HDMI dongle and other using USB-C to DP cable and each of those inputs will give you 4K@120Hz. You will have more resolution options to choose from with USB-C to DP cable. HDMI is very limited on M1 Macs so it's best to avoid it. One thing to note that when using USB-C to HDMI adapter (either VMM6100 or VMM7100), you'll have one annoying bug where your Mac will not wake from sleep. The only way I found it to make it work again is to unplug the adapter and plug back in. Minor annoyance but this is only happening when using USB-C to HDMI adapter on Mac. USB-C to DP cable works fine.

 

[Donga120]

I successfully flashed the Anker 518 USB-C to HDMI 2.1 adapter and it works at 4K@120Hz PCM with my LG 42LX1Q6LA (same panel as the LG C2) and a M1 MacBook Air 👍🏼

I used Parallels and needed to download the VMMHIDtool from the Microsoft Store to flash it. I had it connected to a standard USB-C (10Gbps) on my Mac Studio while flashing it with no display connected.

Can you use a normal Windows PC for flashing? I have a gaming PC I can use or do you need to use Parallels?

Thinking of buying the Anker 518 for my other M1 Mac Studio

 

[Pressure]

Can you use a normal Windows PC for flashing? I have a gaming PC I can use or do you need to use Parallels?

Thinking of buying the Anker 518 for my other M1 Mac Studio

Yes, you can - in fact - use a PC running Windows to run Windows applications.

 

[jirachi155]

Ok, here's a weird one I hope someone can help me with.

I have a CM VMM7100 and a Macbook Air M2 and a 2.1 UHD 8k HDMI cable.

I had a few other adapters (before buying the CM one) that used to work at 120hz with my TV on lower resolutions (1440p for instance). The VMM7100 was also able to reach 120hz on lower resolutions.

Now since I flashed the custom firmware on the VMM7100, I have multiple issues:

• I can only reach 60hz on all resolutions with my CM adapter
• I can only reach 30hz with ALL resolutions and ALL of my other HDMI adapters and cables

I'm really afraid something went wrong along the way, even if I just followed the instructions and I can't fix it.

Has this happened to anyone? Can anyone recommend something I can try?

Thank you.

 

[syawaworht]

The firmware in the zip that we're suppose to use differs from the firmware on the site https://kb.cablematters.com/index.php?View=entry&EntryID=161

The firmware on the site is the same as the one in the recover folder in the zip.

What is changed about the firmware that we're supposed to use in the zip? Where is it from?

And from what I gather, we need the custom firmware because the official firmware won't support 4k120hz 4:4:4 10b?

 

[spehero]

Hi all, first of all thanks for the guide, yes it worked quite well. At least I got 4k AT 120Hz, with a minor flaw. I don't know if this is related to this workaround but whenever I use usb-c on my MAC to connect to LG C2 42", resolution doesn't really fit. If I switch to traditional HDMI Port, it's just perfect, except being 60Hz.

Any idea what's missing here? Probably I'm missing a settings somewhere. attaching a photo sowing the edges of the monitor and how screen is not a fit, even I can't see the menu. this is almost same for all resolutions.

Is your HDMI input set to 'PC'? Dashboard -> vertical ellipsis -> edit inputs -> select correct HDMI input -> click on the little icon -> select 'PC'


Then go to 'Picture' -> 'Aspect Ratio' and select '16:9' -> 'Just scan' should be On by default I believe, if it's not turn it on.

 

[Auto360]

Hey guys, can someone help me with flashing through parallels? i bought a cable from usb-c to hdmi 2.1 with the VMM7100, but have no idea how to make it show up in parallels, and the VMMHIDTool shows me the spyder chip error. i'm using the microsoft store app. thanks

 

[NissarK]

Hi,
Sorry for being such a noob, but I really need to understand what the process is for making this work.

I have:
- MacBook Pro 14” M2 Max (2023)
- CalDigit TS4
- LG C2 42” OLED TV
- No Windows Computer

Currently connected to the TS4 dock via the Thunderbolt 4 cable for all accessories. For display I connect the MacBook to the C2 via the computer’s HDMI port and I have 4K HDR 120hz.

It is really inconvenient with two cables each time the laptop needs to be mounted and I loose my TV’s image settings every time the computer is disconnected from TV.

So, can somebody please in layman terms explain what needs to be done step by step or refer to a YouTube video?

Thanks a lot!

 

[acmac]

Hey guys, can someone help me with flashing through parallels? i bought a cable from usb-c to hdmi 2.1 with the VMM7100, but have no idea how to make it show up in parallels, and the VMMHIDTool shows me the spyder chip error. i'm using the microsoft store app. thanks

I tried it through Parallels as well and could never get the adapter detected. Ended up using my work Windows computer and it detected it right way. Flashed successfully

 

[Gisg]

WARNING 31.10.23: macOS Sonoma 14.1 breaks HDR with HiDPI 4k@120hz RGB. We are looking for a solution.

NOTE: To ensure proper credit for this solution, kindly reference this thread when sharing. Thanks!

Apple limited HDMI-Transportstream over USB-C/TB/DP to maxed 4k@60hz.

We found a solution to get more than this working!
This is a new fresh thread to talk about this, because the other one has over 46 sites now.

This how-too will be updated and are up to date.

##########
##########


So basically things you'll need for 4k@120hz RGB 10bit HDR

PRIO: MacOS Ventura 13.4 or newer is needed (MacOS Sonoma or newer is best)

1. 1.1.
   USB-C>HDMI 2.1 Cable Matters Adapter (CM Page) with Chip VMM6100 or VMM7100(better) - both works now!
   The new one is the 201388-A = VMM7100
   The old one is: 201388(GRY) = VMM6100
   View attachment 2190617
   
   (It can probably also work on another Adapters with Chip VMM6100 or VMM7100. No guarantee! U can test and report)
   
   VMM7100: (Plug&Play)
   Another adapters that seem to be working:
   USB-C>HDMI 2.1:
   Anker
   CABLETIME
   
   
   VMM6100: (EDID override needed)
   Another adapters that seem to be working:
   USB-C>HDMI 2.1:
   MOSHOU C-008 and MOSHOU C-006, MOSHOU C-006
   4XEM and 4XEM
   Noname
   
   1.2.
   DP>HDMI 2.1: VMM7100: (Plug&Play)
   CableMatters 102101
   Plz use Archive: CM Firmware 4k 120hz RGB VMM7100 ONLY DP to HDMI 2 1
2. HDMI 2.1 official cable with 48Gbps certified bandwidth ( KabelDirekt, UltraHDTV, AmazonBasic ) best is to use one under 2m or shortest u can!
3. Windows PC with USB-C DP capabilities and the flasher tool in the archive or VMMHIDTool from MicrosoftStore
   3.1. (only VMM7100) Using Parallels will only work when using MicrosoftStore VMMHIDTool (Don't forget to activate the USB ports of your Win Image and additionally activate the port every time up you boot the Win image)
4. Download CM_Firmware_4k_120hz_RGB_VMM7100.zip or CM_Firmware_4k_120hz_RGB_VMM6100.zip attached to this post, VMMTool64 for flashing firmware and correct firmware are included.
5. (only needed for VMM6100) BetterDisplay to extract/apply custom EDID
6. (only needed for VMM6100) AW EDID Editor to modify EDID

INFO:

Connecting this Adapters over an TB4 or TB3 Hub/Dock works also when its support Titan Ridge with HBR3 to source Mac

Working Docks/Hubs reported till now:
- i-tec
- Dell WD19TB
- ThinkPad Universal Thunderbolt 4 Dock 40B00135AU
- OWC Thunderbolt Hub
- CalDigit TS4 (also DP>HDMI2.1)
- Kensington SD5780T
- Sonnet Echo 20

(plz report if another Docks/Hubs work also)


Steps

1. Update the HDMI type to "PC" on your LG OLED to whichever port you are going to use. Also enable HDMI Ultra HD Color 4k Mode
2. Plug in cable matters adapter to a USB C port that supports DP on your Windows PC. The HDMI cable connected to the adapter will need to be connected to a tv/monitor for the next step.
3. Launch update tool and verify you have VMM6100 or VMM7100. Follow steps for the Firmware update attached to this post and are included in zip packages VMM6100 USB-C > HDMI, VMM7100 USB-C > HDMI or VMM7100 DP > HDMI. Use the correct firmware included in each zip package named: VMM6100_4kRGB120hz10b_V6_05_120.fullrom, VMM7100_4kRGB120hz10b_V7_02_112.fullrom or VMM7100_DP_to_HDMI_2_1_CM_7.02.112_MacOS 4K120Hz.fullrom
   3.1. (Optional) - Make backup of your firmware first
4. Once it's completed flashing, unplug and replug the adapter to verify your new firmware version is for the VMM6100: 6.03.002 and for the VMM7100: 7.02.112
5. (only needed for VMM6100) Plug the adapter back in your mac and follow the steps here to apply Custom EDID (Enable DP-Transportstream over HDMI) (An example DP-Transportstream with force RGB "DP_STREAM-RGB.zip" are attached in this post. Extract first)
6. (only needed for VMM6100) Activate "Auto Apply EDID" and "Config Protection" in BetterDisplay
7. Check if ure on 4:4:4 when 4k@120hz is selected > read here how to test

MONITOR WAKE PROBLEMS:
(TVs without DCC over HDMI has to be always turn on over the remote! On LG OLEDs theres an option called "always on" if u want)
UPDATE: With MacOS Sonoma the walkup problem is gone/a lot better on my side!

- Plz update to Ventura 13.4 or newer (MacOS Sonoma or newer is best)
- You can also disabling hibernate mode when connected to a power source (in batterie settings)
- Monitor not want to wake can be fixed sometimes with this settings in BetterDisplay:

View attachment 2190616
( On my side(VMM7100 with TB4 Dock) it works better when i switch of this function!! )

INFO about 8bit in BetterDisplay or SRX:

We believe that the 8-bit display in BetterDisplay may be due to a macOS bug. To ensure that the signal is actually 10-bit, please check the signal information on your monitor.
UPDATE: With MacOS Sonoma the 10bit issue is gone!

SUPPORT:

For those where this Tweak not work correctly, plz send information about ure Adapter, screenshot from BetterDisplay Display informations (first 3 sections), VmmDPTool firmware info and upload ure original and modified EDID plz. Thanks.

And if another guys can help here in support i will be happy. I have not that much time to do that alone. Thanks!


Credits

• @AironMan - Release first 4k@120hz 4:2:2 10b EDID solution with @stevemr123 , analysis why some people reach RGB4:4:4, found solution in combination in Hardware/Chip and special Firmware Version, postet first Firmware to reach 4:4:4 8b without the need of external Software with VMM7100 (outdated) , posted an Firmware where RGB4:4:4 4k@120hz 10b HDR is possible on VMM6100, knowledge USB-C/HDMI/DP protocols and devices, making this FAQ and continue support and update for this
• @stevemr123 - Release BetterDisplay with override EDID functionality and support in this, release first 4k@120hz 4:2:2 10b EDID Solution with @AironMan , in-depth knowledge USB-C/HDMI/DP protocols and devices
• @joevt - in-depth knowledge USB-C/HDMI/DP protocols and devices
• @Alan Spiegel and @hPandaa1 - Reported RGB4:4:4 10bit working on there Adapters and provided some informations about this Adapters to better understand what's going on
• @Djlild7hina for making the first version of this how-too
• PLZ support and buy BetterDisplay, because without them we do never found this solution! After @stevemr123 (BetterDisplay) and @AironMan testet some EDID "tweak" and got a working solution, @AironMan contact CM with all details informations so finally some month later we got a VMM7100 without EDID override needed!
• Also many thanks to CableMatters support in helping getting a new solution for the VMM7100, support them and buying their Adapters! Thanks to Grace an Andrew from CM support!

##########
##########

I found a mini DP to HDMI adapter with a VMM7100 chip. I wanted to ask if the mini DP to HDMI adapter can use your attached firmware "CM Firmware 4k 120hz RGB VMM7100 ONLY DP to HDMI 2 1"?

 

[Tatsh]

I just wanted to post and give my experience with Samsung's new Odyssey G9 Neo 57" (Native Resolution of 7,680 x 2,160 at 240hz)

Even though this monitor is 240hz, my goal is honestly to get at least 120hz on both PC and Mac at the full 7,680 x 2,160.

I plan to use this monitor with both my PC and M1 Macbook Pro through the monitors built in KVM. My PC has a 2080ti (I know I know) but since that GPU can only do 120hz through DP, I'm left with trying to use HDMI for my M1 MBP.

I bought both the Cable Matters Adapter (USB-C to HDMI 2.1) as well as the Anker Adapter (USB-C to HDMI 2.1) (both VMM7100). After flash both of them with the new firmware (through Parallels on my Mac) here are my findings for the Macbook Pro M1.

Using a single adapter USB-C to HDMI 2.1 (flashed with the latest firmware) I was only able to achieve 5,120 x 1440 (120hz). Without flashing I got the same resolution but only 60hz.

Using both adapters USB-C to HDMI 2.1 (Cable Matters and Anker) plugged into the same monitor, I enabled the PBP (Picture by Picture) and able to achieve 3840x2160 for each half of the screen (so total 7680x2160)... but only 1 side can do 120hz while the other side is locked to 60hz. I should note both sides of the screen would allow the Macs scaling (because otherwise things are way too small).

If anyone knows a workaround to get the full 7,680 x 2,160 at 120hz on a Macbook Pro M1 through USB-C to HDMI please let me know.

Until then I will probably just stick to using a single Adapter and running 5,120 x 1440 120hz because having half the screen in 60hz is really annoying.

Another option I've considered is to stick with DP on the Mac (since it can do 7,680x2,160 at 120hz) and try to find a DP to HDMI for my PC.

With 5120x1440 @ 120hz are you getting HiDPI or is it low resolution mode?

Just got this monitor and I am getting a lot of similar issues like not being able to have both sides as 120 hz when using PBP. I have not yet purchased adapters listed here but I will soon. I am using an M2 MacBook Pro. Of course I would rather use one cable and have the macOS menubar go across both screens than what I get with PBP.

I am using a USB-C to DisplayPort adapter from CableCreation and the only issue is that 5120x1440 refuses to give an option with HiDPI. No tools like SwitchResX will do this. All my issues would be resolved if that would just work.